CMB Hemispherical Asymmetry: Long Mode Modulation and non-Gaussianity
Cosmology and Nongalactic Astrophysics
2015-06-19 v2 High Energy Physics - Theory
Abstract
The observed hemispherical asymmetry in CMB map can be explained by modulation from a long wavelength super horizon mode which non-linearly couples to the CMB modes. We address the criticism in [1] about the role of non-Gaussianities in squeezed and equilateral configurations in generating hemispherical asymmetry from the long mode modulation. We stress that the modulation is sensitive to the non-Gaussianity in the squeezed limit. In addition, we demonstrate the validity of our approach in providing a consistency condition relating the amplitude of dipole asymmetry to f_{NL} in the squeezed limit.
Cite
@article{arxiv.1405.7317,
title = {CMB Hemispherical Asymmetry: Long Mode Modulation and non-Gaussianity},
author = {Mohammad Hossein Namjoo and Ali Akbar Abolhasani and Shant Baghram and Hassan Firouzjahi},
journal= {arXiv preprint arXiv:1405.7317},
year = {2015}
}
Comments
References added, JCAP published version